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Note 9 - Income Taxes - Income Tax Provision (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current      
Federal $ 3,117 $ 3,120 $ 3,131
State 551 651 580
Current income taxes 3,668 3,771 3,711
Deferred      
Federal (1,091) 546 508
State 72 30 (71)
Deferred income taxes (1,019) 576 437
Total income tax provision $ 2,649 $ 4,347 $ 4,148